WO2023048257A1

WO2023048257A1 - Vehicle

Info

Publication number: WO2023048257A1
Application number: PCT/JP2022/035474
Authority: WO
Inventors: 充宏阿曽; 賢一堀口
Original assignee: いすゞ自動車株式会社
Priority date: 2021-09-27
Filing date: 2022-09-22
Publication date: 2023-03-30
Also published as: DE112022004687T5; CN117999175A; JP2023047656A

Abstract

Provided is a vehicle with a cargo room provided on a vehicle body frame, the vehicle comprising: drive motors respectively provided for each of a pair of first rear wheels 50 and a pair of second rear wheels 55 disposed at a predetermined interval in the front–rear direction of the vehicle, the drive motors rotating the first rear wheels 50 and second rear wheels 55 independently; and a pair of suspension mechanisms 100 supporting a first axle of the first rear wheels 50 and a second axle of the second rear wheels 55. The suspension mechanism 100 includes: a first arm 110 which is coupled to the first axle of the first rear wheels 50 and the longitudinal direction of which extends in the front–rear direction; a second arm 115 which is coupled to the second axle of the second rear wheels 55 and the longitudinal direction of which extends in the front–rear direction; a support shaft 120 that causes one end of the first arm 110 in the longitudinal direction and one end of the second arm 115 in the longitudinal direction to be rotatably supported with respect to the vehicle body frame; a first spring member 130 provided between the other end of the first arm 110 in the longitudinal direction and the vehicle body; and a second spring member 135 provided between the other end of the second arm 115 in the longitudinal direction and the vehicle body.

Description

vehicle

The present invention relates to a vehicle provided with a luggage compartment on the vehicle body frame.

A vehicle, such as a truck, has been proposed in which drive wheels are rotated independently by an electric motor (see Patent Document 1). This vehicle has a suspension mechanism to reduce shocks during running.

Japanese Patent Application Laid-Open No. 2021-41896

By the way, from the viewpoint of ease of getting in and out of the luggage compartment of the vehicle, there is a demand for a lower floor of the luggage compartment. However, in a vehicle with a heavy gross vehicle weight in which the luggage compartment is provided on the vehicle body frame, an axle suspension type suspension is adopted to support a high load, and it has been difficult to lower the floor of the luggage compartment.

Therefore, the present invention has been made in view of these points, and it is an object of the present invention to realize a low floor of the luggage compartment of a vehicle with a heavy gross vehicle weight.

According to one aspect of the present invention, a vehicle having a luggage compartment on a vehicle body frame, wherein each of a pair of first rear wheels and second rear wheels arranged at a predetermined interval in the front-rear direction of the vehicle has a driving motor provided to independently rotate the first rear wheel and the second rear wheel; and a pair of suspension mechanisms supporting a first shaft of the first rear wheel and a second shaft of the second rear wheel. , wherein the suspension mechanism includes a first arm portion connected to the first shaft of the first rear wheel and having a longitudinal direction extending in the front-rear direction; and the second arm portion of the second rear wheel. a second arm connected to a shaft and having a longitudinal direction extending in the longitudinal direction; one end of the first arm in the longitudinal direction; and one end of the second arm in the longitudinal direction. together rotatably supported on the vehicle body frame, a first spring member provided between the other longitudinal end of the first arm portion and the vehicle body, and the second arm and a second spring member provided between the other longitudinal end of the portion and the vehicle body.

Also, the first arm portion and the second arm portion may rotate independently around the support shaft.

Also, the first arm portion and the second arm portion may be integrally rotated around the support shaft.

The longitudinal length of the first arm portion is greater than the diameter of the first rear wheel, and the longitudinal length of the second arm portion is greater than the diameter of the second rear wheel. Largely, the first spring portion and the second spring portion may be coil springs arranged along a vertical direction.

Further, the suspension mechanism includes a first damper portion that joins both end sides of the first spring portion to the other end portion of the first arm member and the vehicle body, and both end sides of the second spring portion to the It may further include a second damper portion joined to the other end portion of the second arm member and the vehicle body.

Further, a pair of first bearings provided at the one end of the first arm to support both ends of the support shaft, and a pair of first bearings provided at the one end of the second arm to support both ends of the support shaft. and a pair of second bearings that support the .
Further, the floor surface of the luggage compartment may be lower than the center of the first rear wheel and the second rear wheel in the vertical direction, and may be positioned between the pair of suspension mechanisms in the vehicle width direction. .

　According to the present invention, it is possible to realize a low-floor luggage compartment of a vehicle with a heavy gross vehicle weight.

1 is a schematic diagram for explaining an external configuration of a vehicle 1; FIG. 1 is a schematic diagram for explaining the configuration of a suspension mechanism 100 according to a first embodiment; FIG. FIG. 4 is a schematic diagram for explaining the arrangement of a first spring member 130; FIG. 4 is a schematic diagram for explaining movements of a first spring member 130 and a second spring member 135; FIG. 4 is a schematic diagram for explaining movements of a first spring member 130 and a second spring member 135; FIG. 5 is a schematic diagram for explaining the configuration of a suspension mechanism 100 according to a second embodiment; FIG. 4 is a schematic diagram for explaining movements of a first spring member 130 and a second spring member 135; FIG. 4 is a schematic diagram for explaining movements of a first spring member 130 and a second spring member 135;

<Overview of vehicle>
An overview of a vehicle according to one embodiment will be described with reference to FIG.

FIG. 1 is a schematic diagram for explaining the external configuration of the vehicle 1. FIG. Vehicle 1 is a truck as an example. Also, the vehicle 1 is an electric vehicle driven by an electric motor. As shown in FIG. 1, the vehicle 1 includes a body frame 10, a cab 20, a luggage compartment 30, front wheels 40, a first rear wheel 50, a first drive motor 52, a second rear wheel 55, It has a second drive motor 57 .

The body frame 10 is a skeleton that supports the vehicle 1. The vehicle body frame 10 has a pair of side members extending in the longitudinal direction of the vehicle 1 and a cross member extending in the vehicle width direction for connecting the pair of side frames. The vehicle body frame 10 is positioned lower than the center of the first rear wheel 50 and the second rear wheel 55 in the vertical direction in order to lower the floor of the cargo room 30 .

The cab 20 is provided on the body frame 10. Inside the cab 20 is formed a compartment in which passengers such as a driver sit. A communication port communicating with the luggage compartment 30 may be formed on the rear side of the cab 20 , in which case the driver can move from the cab 20 to the luggage compartment 30 .

The luggage compartment 30 is provided on the vehicle body frame 10 and positioned behind the cab 20 . The luggage compartment 30 is formed, for example, in the shape of a box, and a space for storing luggage is formed inside.

The front wheels 40 are the front wheels of the vehicle 1 and are a pair of wheels connected to the left and right sides of the vehicle body. The front wheels 40 are non-driving wheels here, and the front wheels 40 are steered by the driver's operation of the steering wheel.

The first rear wheels 50 are the rear wheels of the vehicle 1 and are a pair of wheels connected to the left and right sides of the vehicle body. The first rear wheel 50 is a drive wheel in this embodiment and is driven by a first drive motor 52 . A first shaft (rotating shaft) of the first rear wheel 50 is supported by a suspension mechanism, which will be described later.

The first drive motor 52 is provided for each of the pair of first rear wheels 50 and rotates the first rear wheels 50 independently. The first drive motor 52 is mounted in the left first rear wheel 50 (first rear wheel 50L in FIG. 2) and in the right first rear wheel 50 (first rear wheel 50R in FIG. 2). , respectively.

The second rear wheels 55 are a pair of wheels connected to the left and right sides of the vehicle body, which are arranged in front of the first rear wheels 50 by a predetermined distance for reasons described later. The second rear wheel 55 is a drive wheel and driven by a second drive motor 57 . A second shaft (rotating shaft) of the second rear wheel 55 is also supported by a suspension mechanism, which will be described later.

The second drive motor 57 is provided for each of the pair of second rear wheels 55 and rotates the second rear wheels 55 independently. The second drive motor 57 is mounted inside the left second rear wheel 55 (the second rear wheel 55L in FIG. 2) and inside the right second rear wheel 55 (the second rear wheel 55R in FIG. 2). , respectively.

In the vehicle 1, the floor surface 32 of the luggage compartment 30 is lowered, and the floor surface 32 is lower than the upper surface 59 of the wheel house of the first rear wheel 50 and the second rear wheel 55. In the present embodiment, in order to realize a low floor of the luggage compartment 30 from the viewpoint of ease of getting in and out of the luggage compartment 30, the floor surface 32 has the first rear wheel 50 and the second rear wheel 55 in the vertical direction. is lower than the center of Thereby, the passenger can get in and out of the luggage compartment 30 in one step.

By the way, there is a limit to the load that can be supported by one wheel with ordinary tires, and double tires are used to disperse the load on one wheel when the allowable load is insufficient for heavy vehicles such as trucks. . However, if double tires are used in the vehicle 1, the width of the floor surface 32 (specifically, the space between the left and right wheelhouses of the rear wheels) becomes narrow, and the advantage of lowering the floor surface 32 cannot be utilized. do not have. Further, when the vehicle 1 is a heavy vehicle such as a truck, the suspension mechanism supporting the shafts of the first rear wheel 50 and the second rear wheel 55 is preferably a mechanism capable of withstanding a high load. As a suspension that can withstand a high load, an axle suspension type is usually adopted because it uses a leaf spring with little contradiction between the spring multiplier and the amount of stroke. Surface 32 cannot be lowered.

On the other hand, in the present embodiment, although the details will be described later, an independent suspension type suspension is used to realize a low floor of the luggage compartment 30 while withstanding a high load. In addition, in this embodiment, since the first rear wheel 50 and the second rear wheel 55 are arranged in the front-rear direction, compared to the case of using double tires for the purpose of increasing the allowable load of the tires, the vehicle width direction of the wheel house is reduced. can be shortened, and a large distance can be secured between the wheel houses. As a result, for example, the trolley can pass between the wheel houses in the luggage compartment 30, improving workability.

<Structure of Suspension Mechanism>
A first example and a second example will be described as a suspension mechanism according to the present embodiment.

(First embodiment)
FIG. 2 is a schematic diagram for explaining the configuration of the suspension mechanism 100 according to the first embodiment.
As shown in FIG. 2, there are a pair of suspension mechanisms 100, a suspension mechanism 100L supporting the shafts of the first rear wheel 50L and the second rear wheel 55L on the left side, and a suspension mechanism 100L supporting the first rear wheel 50R and the second rear wheel 55R on the right side. and a suspension mechanism 100R that supports the shaft. The suspension mechanism 100</b>L and the suspension mechanism 100</b>R are independent suspension suspensions and are arranged at positions that do not cross the body frame 10 .

The body frame 10 has a pair of side members 12 extending in the longitudinal direction and a cross member 14 extending in the vehicle width direction. The

suspension mechanisms

100L and 100R are positioned outside the side members 12 in the vehicle width direction. A floor surface 32 of the luggage compartment 30 is located between the suspension mechanism 100L and the suspension mechanism 100R in the vehicle width direction.

Since the suspension mechanism 100L and the suspension mechanism 100R have the same configuration, the suspension mechanism 100L will be described below as an example. As shown in FIG. 2, the suspension mechanism 100L includes a first arm portion 110, a second arm portion 115, a support shaft 120, a first spring member 130, a second spring member 135, a bearing 140, a It has a first damper section 150 and a second damper section 155 .

The first arm portion 110 is connected to a first shaft (not shown) of the first rear wheel 50L and extends longitudinally in the longitudinal direction of the vehicle 1 . One end of the first arm portion 110 is located forward of the first rear wheel 50L in the front-rear direction, and the other end of the first arm portion 110 is located behind the shaft (not shown) of the first rear wheel 50L. located on the side.

The second arm portion 115 is connected to a second shaft (not shown) of the second rear wheel 55L and extends longitudinally in the longitudinal direction of the vehicle 1 . One end of the second arm portion 115 is positioned behind the second rear wheel 55L in the front-rear direction, and the other end of the second arm portion 115 is positioned further than the shaft (not shown) of the second rear wheel 55L. located on the front side.

The first arm portion 110 and the second arm portion 115 are made of separate members. Therefore, the first arm portion 110 and the second arm portion 115 rotate independently around the support shaft 120 . In addition, the first arm portion 110 and the second arm portion 115 are arranged along the front-rear direction on the outside of the side member 12 in the vehicle width direction. Therefore, since the first arm portion 110 and the second arm portion 115 do not cross the side members 12 of the body frame 10, the floor surface 32 of the luggage compartment 30 provided on the body frame 10 can be lowered.

The support shaft 120 connects one end of the first arm portion 110 and one end of the second arm portion 115 . The support shaft 120 rotatably supports one longitudinal end of the first arm portion 110 and one longitudinal end of the second arm portion 115 with respect to the vehicle body frame 10 . Therefore, the first arm portion 110 and the second arm portion 115 rotate about the support shaft 120 when an impact acts on the first rear wheel 50 or the second rear wheel 55 . Note that the support shaft 120 is supported by the body frame 10 (for example, the side member 12).

The first spring member 130 is provided between the other longitudinal end of the first arm portion 110 and the vehicle body. The first spring member 130 is a coil spring here. When the first spring member 130 is positioned at the other end of the first arm portion 110, the distance between the support shaft 120 positioned at the one end and the first spring member 130 can be increased. In particular, in the present embodiment, since the length of the first arm portion 110 is greater than the diameter of the first rear wheel 50, the first spring member 130 is extended from the support shaft 120 beyond the axis of the rear wheel 50 (not shown). can be released. As a result, since the lever ratio can be added to the spring multiplier of the coil spring used as the first spring member 130 for the shaft (not shown) of the rear wheel 50L, the effective spring multiplier can be increased and the stroke can be increased. 1 Spring member 130 can withstand high loads.

FIG. 3 is a schematic diagram for explaining the arrangement of the first spring member 130. FIG. The first spring member 130 is arranged along the vertical direction, as shown in FIG. One end of the first spring member 130 is located on the first arm portion 110 side, and the other end of the first spring member 130 is located on the vehicle body (specifically, the upper surface 59 of the wheel house).

The second spring member 135 is provided between the other longitudinal end of the second arm member 15 and the vehicle body. The second spring member 135 is a coil spring here. When the second spring member 135 is positioned at the other end of the second arm portion 115, the distance between the support shaft 120 positioned at the one end and the second spring member 135 can be increased. In particular, in this embodiment, since the length of the second arm portion 115 is greater than the diameter of the second rear wheel 55, the second spring member 135 is moved from the support shaft 120 to the shaft (not shown) of the second rear wheel 55. can be released beyond. As a result, since the lever ratio can be added to the spring multiplier of the coil spring used as the second spring member 135 for the shaft (not shown) of the second rear wheel 55L, the effective spring multiplier can be increased and the stroke can be increased. , the second spring member 135 can withstand high loads. In the above description, the first spring member 130 and the second spring member 135 are coil springs, but are not limited to this, and may be air springs, for example.

4A and 4B are schematic diagrams for explaining the movements of the first spring member 130 and the second spring member 135. FIG. As shown in FIG. 4A, when the vehicle 1 travels on a flat road surface, the first spring member 130 and the second spring member 135 do not expand and contract. On the other hand, when the second rear wheel 55 rides on a bump on the road surface as shown in FIG. 4B, the second spring member 135 contracts. As described above, since the first arm portion 110 and the second arm portion 115 rotate independently, the first spring member 130 does not expand or contract even if the second spring member 135 contracts. That is, the first spring member 130 and the second spring member 135 expand and contract independently.

The bearings 140 are bearings that support both ends of the support shaft 120 . The bearing 140 is provided at one end of the first arm portion 110 and one end of the second arm portion 115, as shown in FIG. Specifically, two bearings 140 are provided at one end of the first arm portion 110 and two bearings 140 are provided at one end of the second arm portion 115 . The two bearings provided at one end of the first arm portion 110 correspond to a pair of first bearings, and the two bearings provided at one end of the second arm portion 115 correspond to a pair of second bearings. do. Here, since the load acting on the second arm portion 115 is assumed to be large, the bearing 140 provided on the second arm portion 115 is positioned outside. When the load acting on the first arm portion 110 is large, the bearing 140 provided on the first arm portion 110 may be arranged outside.

When the shaft attachment 140 supports the support shaft 120, the problem that occurs when the bush supports the support shaft 120 can be resolved. In the case where the bush supports the support shaft 120, the bush bends when the vehicle 1 turns, causing the rear wheels to turn outward, which causes oversteer. On the other hand, when the bearing 140 is used, it is possible to prevent the occurrence of oversteer due to the bending of the bush.

Also, when the bearing 140 is used, the first arm portion 110 and the second arm portion 115 are easier to rotate smoothly than when bushes are used. In particular, in the case where the first drive motor 52 and the second drive motor 57 are arranged in the first rear wheel 50 and the second rear wheel 55, the gyro effect due to the high inertia causes the first arm portion 110 and the second arm portion 110 to move. Although the movement of the arm portion 115 tends to deteriorate, deterioration of the movement of the first arm portion 110 and the second arm portion 115 can be suppressed by using the bearing 140 .

The first damper part 150 is arranged so as to pass through the first spring member 130 coaxially, as shown in FIG. The first damper portion 150 on one end side of the first spring member 130 is joined to the first arm portion 110, and the first damper portion 150 on the other end side of the first spring member 130 is connected to the vehicle body (for example, the upper surface of the wheel house). 59). When a bush is used at one end of the first arm portion 110, deflection of the bush may cause deflection of the first arm portion 110 compared to the bearing 140. By providing the portion 150, vibration of the first arm portion 110 can be suppressed.

The second damper portion 155 is arranged so as to pass through the second spring member 135 coaxially, similarly to the first damper portion 150 . A second damper portion 155 on one end side of the second spring member 135 is joined to the second arm portion 115, and a second damper portion 155 on the other end side of the second spring member 135 is attached to the vehicle body (for example, the upper surface of the wheel house). 59). By providing the second damper portion 155 , it is possible to suppress the vibration of the second arm portion 115 in the same manner as the first damper portion 150 .

By the way, by using the above-described independent suspension type suspension mechanism 100, it is possible to lower the floor of the luggage compartment 30 and dispose, for example, a battery, an inverter, etc. under the luggage compartment 30. 2, the battery 190 that supplies power to the first drive motor 52 and the second drive motor 57 (FIG. 1) is positioned between the suspension mechanism 100L and the suspension mechanism 100R in the vehicle width direction. As described above, since there is no member that crosses the side members 12 of the vehicle body frame 10 , it is possible to dispose the large-sized battery 190 between the pair of side members 12 .

(Second embodiment)
FIG. 5 is a schematic diagram for explaining the configuration of the suspension mechanism 100 according to the second embodiment. The configurations of the first arm portion 110, the second arm portion 115, and the support shaft 120 of the second embodiment are different from those of the first embodiment. Since other configurations are the same as those of the first embodiment, detailed description thereof will be omitted.

In the first embodiment, the first arm portion 110 and the second arm portion 115 are separate members, and rotate independently with respect to the support shaft 120 . In contrast, in the second embodiment, the first arm portion 110 and the second arm portion 115 each form a part of the arm member 170 . The support shaft 120 supports the center of the arm member 170 . Therefore, in the second embodiment, the first arm portion 110 and the second arm portion 115 rotate integrally around the support shaft 120 .

The support shaft 120 of the second embodiment is provided on a bracket 175 fixed to the body frame 10 (for example, the side member 12). Since the first arm portion 110 and the second arm portion 115 are integrated, the arm member 170 is supported only by the two support shafts 120 in the second embodiment.

6A and 6B are schematic diagrams for explaining movements of the first spring member 130 and the second spring member 135. FIG. As shown in FIG. 6A, when the vehicle 1 travels on a flat road surface, the first spring member 130 and the second spring member 135 do not expand and contract. On the other hand, as shown in FIG. 6B, when the second rear wheel 55 rides on a bump on the road surface, the second spring member 135 contracts. Since the first arm portion 110 and the second arm portion 115 rotate together, when the first spring member 130 contracts, the second spring member 135 extends.

<Effects of this embodiment>
The suspension mechanism 100 (100L, 100R) of the embodiment described above is an independent suspension type suspension, and includes a first arm portion 110 and a second arm portion 115 extending in the front-rear direction, and one end portion of the first arm portion 110. and one end of the second arm portion 115, a first spring member 130 and a second spring provided between the other end of the first arm portion 110 and the second arm portion 115 and the vehicle body It has a member 135 .
As a result, the first arm portion 110 and the second arm portion 115 do not intersect with the side members 12 of the vehicle body frame 10, so that the floor of the luggage compartment 30 can be lowered. Further, since the first spring member 130 and the second spring member 135 are arranged at positions separated from the support shaft 120, the lever ratio can be added to the spring multipliers of the first spring member 130 and the second spring member 135. Therefore, the effective spring multiplier is increased, and as a result, the high load of a vehicle with a heavy gross vehicle weight can be endured.

Although the present invention has been described above using the embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments, and various modifications and changes are possible within the scope of the gist thereof. be. For example, all or part of the device can be functionally or physically distributed and integrated in arbitrary units. In addition, new embodiments resulting from arbitrary combinations of multiple embodiments are also included in the embodiments of the present invention. The effect of the new embodiment caused by the combination has the effect of the original embodiment.

1 Vehicle 10 Body Frame 30 Luggage Chamber 50 First Rear Wheel 52 First Drive Motor 55 Second Rear Wheel 57 Second Drive Motor 100 Suspension Mechanism 110 First Arm Section 115 Second Arm Section 120 Support Shaft 130 First Spring Member 135 Second spring member 140 Bearing 150 First damper part 155 Second damper part

Claims

A vehicle having a luggage compartment on a body frame,
a drive motor provided for each of a pair of first rear wheels and a second rear wheel arranged at a predetermined interval in the front-rear direction of the vehicle, and for independently rotating the first rear wheels and the second rear wheels;
a pair of suspension mechanisms supporting a first axle of the first rear wheel and a second axle of the second rear wheel;
with
The suspension mechanism is
a first arm portion connected to the first shaft of the first rear wheel and having a longitudinal direction extending in the front-rear direction;
a second arm portion connected to the second shaft of the second rear wheel and having a longitudinal direction extending in the front-rear direction;
a support shaft that rotatably supports one end portion of the first arm portion in the longitudinal direction and one end portion of the second arm portion in the longitudinal direction with respect to the vehicle body frame;
a first spring member provided between the other longitudinal end of the first arm and the vehicle body;
a second spring member provided between the other longitudinal end of the second arm and the vehicle body;
a vehicle.
The first arm portion and the second arm portion rotate independently around the support shaft, respectively.
A vehicle according to claim 1 .
The first arm portion and the second arm portion rotate integrally around the support shaft,
A vehicle according to claim 1 .
The longitudinal length of the first arm portion is greater than the diameter of the first rear wheel,
the longitudinal length of the second arm portion is greater than the diameter of the second rear wheel;
The first spring member and the second spring member are coil springs arranged along a vertical direction,
A vehicle according to any one of claims 1 to 3.
The suspension mechanism is
a first damper portion that joins both end sides of the first spring member to the other end portion of the first arm portion and the vehicle body;
a second damper portion that joins both end sides of the second spring member to the other end portion of the second arm portion and the vehicle body;
A vehicle according to claim 1 .
a pair of first bearings provided at the one end portion of the first arm portion and supporting both end sides of the support shaft;
a pair of second bearings provided at the one end of the second arm portion and supporting both end sides of the support shaft;
A vehicle according to claim 1 .
The floor surface of the luggage compartment is lower than the center of the first rear wheel and the second rear wheel in the vertical direction, and is positioned between the pair of suspension mechanisms in the vehicle width direction.
A vehicle according to claim 1 .